1 files changed, 65 insertions, 0 deletions
diff --git a/src/g80_dma.c b/src/g80_dma.c
new file mode 100644
index 0000000..63fdbe5
--- /dev/null
+++ b/src/g80_dma.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2007 NVIDIA, Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "g80_type.h"
+#include "g80_dma.h"
+
+void G80DmaKickoff(G80Ptr pNv)
+{
+    if(pNv->dmaCurrent != pNv->dmaPut) {
+        pNv->dmaPut = pNv->dmaCurrent;
+        pNv->reg[0x00c02040/4] = pNv->dmaPut << 2;
+    }
+}
+
+void G80DmaWait(G80Ptr pNv, int size)
+{
+    CARD32 dmaGet;
+
+    size++;
+
+    while(pNv->dmaFree < size) {
+        dmaGet = pNv->reg[0x00c02044/4] >> 2;
+
+        if(pNv->dmaPut >= dmaGet) {
+            pNv->dmaFree = pNv->dmaMax - pNv->dmaCurrent;
+            if(pNv->dmaFree < size) {
+                G80DmaNext(pNv, 0x20000000);
+                if(dmaGet <= SKIPS) {
+                    if(pNv->dmaPut <= SKIPS) /* corner case - will be idle */
+                        pNv->reg[0x00c02040/4] = (SKIPS + 1) << 2;
+                    do { dmaGet = pNv->reg[0x00c02044/4] >> 2; }
+                    while(dmaGet <= SKIPS);
+                }
+                pNv->reg[0x00c02040/4] = SKIPS << 2;
+                pNv->dmaCurrent = pNv->dmaPut = SKIPS;
+                pNv->dmaFree = dmaGet - (SKIPS + 1);
+            }
+        } else
+            pNv->dmaFree = dmaGet - pNv->dmaCurrent - 1;
+    }
+}